Which architectural feature was first introduced in Apple Store designs by Foster + Partners and has since become a signature element of their flagship stores worldwide?

Apple Stores transformed retail architecture with their distinctive design elements that blend form and function. They've become iconic examples of how architectural innovation can define a brand experience and influence customer behavior. This trivia question tests your knowledge about the architectural evolution of Apple's retail spaces and how they've shaped modern retail design principles.

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The Glass Cube entrance
The floating staircase with glass treads
The indoor trees and 'Genius Grove' concept
The stone façade with minimal signage